Finding the Fourth Proportional to 12,443.50, 18,665.62 and 3,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.50 : 18,665.62 = 3,209.50 : x
2. Step 2: Convert to fraction form
   12,443.50/18,665.62 = 3,209.50/x
3. Step 3: Cross multiply
   12,443.50x = 18,665.62 × 3,209.50
4. Step 4: Simplify right side
   12,443.50x = 59,907,307.39
5. Step 5: Solve for x
   x = 59,907,307.39/12,443.50
6. Step 6: Final answer
   x = 4,814.35